turn your back on someone

turn (one's) back on (someone or something)

To ignore, disregard, or exclude someone or something; to abandon, give up on, or forsake someone or something. It's clear that the company has turned its back on customers. After becoming a successful writer, Jim turned his back on all the people he used to know back home.
See also: back, on, turn

turn your back on someone

COMMON If someone turns their back on you, they ignore you and refuse to help you. We appeal to this conference — do not turn your back on the poor. Our job is to protect children and we can't just turn our backs on them.
See also: back, on, someone, turn